LONDON, England (CNN) -- British military investigators interviewed a woman who claimed to have met a man from another planet while she was walking her dog, newly released Ministry of Defence files have revealed.

The woman said she had been approached by a man with a "Scandinavian-type accent" dressed in a flying suit-style outfit while out walking on a sports field near Norwich, eastern England, in 1989.

She claimed to have been "completely terrified" during the 10-minute encounter. Running home, she said she had then seen a large glowing object rising vertically from behind some nearby trees.

The woman called a local military base to report the encounter the following day. A cover note on the file of the incident describes it as "one of our more unusual UFO reports."

The incident is just one of around 1,200 sightings recorded by investigators between 1987 and 1993, according to the files released by the National Archives on Sunday.

On another occasion, military officials took the unusual step of briefing ministers about an unidentified flying object photographed in the sky over Scotland alongside an RAF fighter jet.

Witnesses claimed to have seen the large diamond-shaped object hanging in the air for about 10 minutes before it ascended vertically at high speed. Fearing intense media interest, investigators also commissioned detailed drawings of the object.

The files also reveal that the Ministry of Defence abandoned plans to build a computer database of sightings out of fears of a public relations disaster should details of its existence ever be revealed.

"I personally doubt that the the MoD would lose much if we filed UFO reports in 'WPD' (the waste paper basket)," one unnamed official wrote of the project.